As EugeneL mentioned - https://developer.apple.com/forums/thread/669955?answerId=664128022#664128022, my solution was to open a file in a new window. However, someone else discovered that opening a new tab works even better. There's an assortment of other solutions here.
Xcode 12 - Project Navigator width is stuck/locked, can't resize - https://stackoverflow.com/questions/65851619/xcode-12-project-navigator-width-is-stuck-locked-cant-resize
aheze
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How can I pass data from a Playground Page to another Playground Page in Swift Playgrounds?
Btw, PlaygroundKeyValueStore.current.keyValueStore["myKey"] didn't work for me. Instead, try
PlaygroundKeyValueStore.current["myKey"]
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